# STC SA3074NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Preferred Improvements LLC, United States
- Description: This modification requires that the following two (2) placards be placed on the inside of the forward (L.H.) cargo door in full view of the cargo loading crew: MAXIMUM PAYLOAD CAPACITY -7500 lbs. or less, CARGO LOADING METHOD-Refer to FAA App Oper Handbk.
- Applied: July 23, 1985
- Status date: February 24, 2017
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21, Part 135
- Data sheets: [TCDS A-669](https://openairdocs.org/tcds/A-669)
- Certificate PDF: https://openairdocs.org/files/sha256/39/10/39106d39d17dfc330e30dde18d442c12860b864b5eb9107e70159057e9e06037
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8A73CFE824C51B21862580D5005A60A1.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3074NM

## ADs that name it (0)

None.

## Approved models (2)

- The Boeing Company DC3A-S1C3G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3C-S1C3G ([TCDS A-669](https://openairdocs.org/tcds/A-669))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

Number SA3074NM Reissued on February 23, 2017, to supersede the original STC, which has been lost or misplaced.

This certificate, issued to Preferred Improvements, LLC 11234 Hackett Rd Apple Creek, OH 44606

Part * of the * Regulations.

Special Federal Aviation Regulation 38, FAR 135.1(a)(3), & FAR 135.2(d). (In addition to Aero. Bulletin 7A) Original ProductType Certificate Number: A-669 Make: McDonnell Douglas Model: DC3C-S1C3G and DC3A-S1C3G

Description of the Type Design Change: This modification requires that the following two (2) placards be placed on the inside of the forward (L. H.) cargo door in full view of the cargo loading crew:

**MAXIMUM PAYLOAD CAPACITY CARGO LOADING METHOD 7500 LBS. OR LESS REFER TO FAA APPROVED**

**OPERATIONS HANDBOOK**

Limitations and Conditions: Approval of this change in type design applies basically to the above model aircraft only. This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate shall be maintained as part of the permanent records for the modified aircraft.

If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

Date of application: July 23, 1985 Date reissued: 2/23/17; 2/24/17 Date of issuance: July 24, 1985 Date amended: October 22, 1987

(Signature)

Manager, Seattle Aircraft Certification Office (Title)

## Every issue (2)

- February 24, 2017: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/39/10/39106d39d17dfc330e30dde18d442c12860b864b5eb9107e70159057e9e06037)
- October 22, 1987: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/c5/c8/c5c85bc1e19a1103c76f9fe044233365c6f6a0929f3bbf867292d27403c000c5)

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